Hook fastener



FIG. 1 is a top perspective view of the hook fastener in accordance withmy design.

FIG. 2 is a bottom perspective view of the hook fastener in accordancewith my design.

FIG. 3 is a left side elevation view of the hook fastener in accordancewith my design, with the right side elevation view being identicalthereto.

FIG. 4 is a top plan view of the hook fastener in accordance with mydesign.

FIG. 5 is a front elevation view of the hook fastener in accordance withmy design.

FIG. 6 is a bottom plan view of the hook fastener in accordance with mydesign; and,

FIG. 7 is a rear elevation view of the hook fastener in accordance withmy design.

The broken lines showing environment structure are for illustrativepurposes and form no part of the claimed design.

The ornamental design for a hook fastener, substantially as shown anddescribed.